Combine soy sauce, rice vinegar, sesame oil, Splenda or brown sugar, green onion, garlic puree and cayenne or hot sauce in small bowl. Put half of mixture into a small ziploc bag with the two pieces of fish and marinate at room temperature for 10-15 minutes.

While fish marinates, spray grill with non-stick spray or wipe with olive oil, then preheat grill to medium-high (you can only hold your hand there 2-3 seconds.)

Put fish on grill with top side down and grill 2-3 minutes (until you can start to see grill marks, I have to lift it up to see.) Rotate 45 degrees on same side and cook 2-3 minutes more to get criss-cross marks. Turn fish over and cook about 3-4 minutes more. Total cooking time will not be more than 8-10 minutes, The fish should feel barely firm when it’s done; don’t overcook. Serve hot, with dipping sauce on the side.